/**
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.tez.runtime.api;

import org.apache.hadoop.classification.InterfaceAudience.Public;
import org.apache.hadoop.yarn.api.records.ApplicationId;
import org.apache.tez.dag.api.UserPayload;

/**
 * Context through which the OutputCommitter can access all the relevant
 * information that it needs. This interface is not supposed to be implemented
 * by users
 */
@Public
public interface OutputCommitterContext {

  /**
   * Get the {@link org.apache.hadoop.yarn.api.records.ApplicationId}
   * @return the {@link org.apache.hadoop.yarn.api.records.ApplicationId}
   */
  public ApplicationId getApplicationId();

  /**
   * Get the current DAG Attempt Number
   * @return DAG Attempt Number
   */
  public int getDAGAttemptNumber();

  /**
   * Get the name of the DAG
   * @return the DAG name
   */
  public String getDAGName();

  /**
   * Get the name of the Vertex
   * @return Vertex Name
   */
  public String getVertexName();

  /**
   * Get the name of the Output
   * @return Output Name
   */
  public String getOutputName();

  /**
   * Get the User Payload for the Output
   * @return User Payload
   */
  public UserPayload getOutputUserPayload();

  /**
   * Get the User Payload for the OutputCommitter
   * @return User Payload
   */
  public UserPayload getUserPayload();
  
  /**
   * Get Vertex Index in the DAG
   * @return Vertex index
   */
  public int getVertexIndex();

}
